Telephony or keying arrangement



Oct. 9, 1928.

Filed m. 22, 1925 2 Sheets-Sheet MENDEL OSNDS BY 4 ,dfa a I TTORNEY Oct. 9, 1928.

M. OSNOS TELEPHONY on KEYING ARRANGEMENT Filed Oct. 22, 1925 2 Sheets-Sheet INVENTOR MENDEL USNUS AT RNEY iii Patented Oct. 9, 1928. w

MENDEL OSNOSrOF BERHN, E MA 5 13 $993I2119EAF FI RDBAB LQSEL TELEGBAPHIE M n. 11., OEBERLINLGERMANY, apoRronArIoN OFGEBNVIAVNYY,

TELEPHONY ORWKEYING nnnanennnnm.

' Application filed October 22, 1925,.Seria1 No. 64,246 and in, German ylflovember :15, 19,24.

In U.. S. patent application Serial No.

63,618, filed October 20, 1925, and United ductorwhich apartfrom the high frequency I currents, istraversed also by the controlling currents. I i q Iifthe value of the' controlling currents flowing in a given axis are to be reduced with reference to the high frequency currents flowing in another. axis, the controlling device, as indicated in the above application," can I be so 7 formed that its conductors are divided into severalgroups which are disposedin series for the controlling currents, and in parallelfor the high frequency currentsfiowing in the other axial direction.

In this modulator device the difliculty is frequently encountered that the controlling currents, in order to be able. to produce an effective influence upon the device, must haveapproximately the same order ofmagnitude as the high. frequency currents to be con.- trolled, While itis desirable, on the other hand, especially in telephony work, to, 0perate with as small controlling currents as possible.

This difficulty. is obviated according to. the present applicationlin that the device Which accomplishes the controlling action (regardless of Whether itserves as a puretelephohy or keying choker, or at the same timeas a frequencyschanger) .is coupledaby means of current transformers with the other circuits to be'regulated. The ratio of transformation of the current transformers must be so chosen that in the circuit or circuits of the controlling device the currents are reduced to the. lowestvalue that may be convenient. For instance, the ratio of transformation may bemade 1:100- The current, transformer, in WGlldHlQWIl manner, may be of the single-coil auto-transformer type, or: of the two-coil orcoupler coil kind, orelse be built similarly. to ammeter current (instrument) transformers.

My invention in its preferred form is illustrated by the accompanying drawing wherein Figs. 1 and '1 illustrate two fundamental ideas of; frequency changer or modulator systems; Fig Q-shQWS-ameans for utilizing my inventionas both a,frequency changer: dodul t :Eigsr ndz h m dis fiedforms of Fig. 2 wherein the output cur-v nt aref d qes ea ci cuit m different.

terminals; Fig. 4;shows, a preferred modi-v fication; applying my inventionto a modua separate, fref ustrates a further at i n y n upplyin queasy c anger; 5 i1? modification of Fig. 4 with a direct coupling of the ,frequency changerto the antenna load, circ it; a d E gho s; a ,preferredem:

d men h n; arrang ment may be use si ot aam equency ha gern i Q -l r tor 1 i In Figs. land 1 .ajnumber ofconstruc tion forms of the said deviceare illustrated. e i g o, tl y gi resi. e: nd: a e the parts made up of the said iron-coated conductor. Thecontrolling currents are fed in he di e ti n. 1? 2-. h idevice is only sed y lulater ok oiL: it cis possible pi ted n: Fig-12am pparatusa fi ting h o trola i 1.11 1aneou i1y s d. as a. fr quency changer -it-js j oined with; ,the. circuit Z by a current transformer t and with the aerial i z yl s u reat ransformer. t wh h is built at the .sanaetinie as av Variable coupler.

hehi l reque cy curr n o t ough vice a, in the ;direction, k by. way of 1 conn ers 0 he modula ion U TIBIIts, fur.- is r m. n o tr rent urce m i h m y .11 for; xample, a mier ph n j a a od u e, r e lik w i ev d e tion Z1 Z2.

T es rr nsement sh wn igs-- 3 nd 3a i er; rem hez b forel h wn 1 1113 n; so a a n his as he econda y urrents spec al y h Of; n: ven ip e) re e iv ed atz rmi a scla, ,k-2, ;b t1 at ar.- m na- 11 r: h sa an emen en rtiw arr y: v geo ssi ce: hez ntmlli gi evice s; p ia ly. ensiti e; te ariatia isr Ofthe' hereinbefore modulating currents, so that not only the modulating current, but also the modulator energy can be chosen very small.

In the formof. construction according to Fig. 4, the. controlling apparatus a serves exclusivcly as a modulator choker (telephony choker), the frequency raising being,if desired, accomplished by means of a special frequency changer 7, arranged in the circuit 1.

As shown in Fig. 5, frequency changer f can be coupled with the aerial circuit also directly (by galvanic means or through a coupler coil 76), the modulator coil (4 being coupled only with the antenna circuit, also in this case througha current trans-former 15- 111 a great'numbcr of cases it may be found advantageous to make the device offecting the control bifilar in nature not only with reference to axis Z, Z but also to axis k 70 However, it is also possible to save one of the current transformer windings in the circuit of the controller apparatus, pro vided the conductor constituting the said device is conveniently shaped. Starting, for instance, from the arrangement l or 1, where the two conductor parts a a bifilar-for the controlling currents supplied at terminals Z Z the conductors a a shown stretched or straight in the direction 70,, Z5 without'changing their relative position, can be bent circular or angularly in several turns, with the ends 70 70 being short circuited. The coil formed in this manner, in an arrangen'ient as shown in Fig. 5, can at the same timebe used as the primary coil of the current transformer 23 It goes without saying that also the current transformer can be constructed in any desired mannensimilarly to the current transformers used in conjunction with ammeters, with an internal straight tubular or cylindrical conductor for the power current, and with a hollow cylinder made of a suitable refractory insulation material surrounding the former co-aXially and carrying the feeble current. Instead of choosing a circular shape, this current transformer could alsobe built flat.

Also in combination with other arrangementsthe constructional form of the modulator device as hereinbefore described could be employed analogously. .In an arrangement as in Fig. 2 the devicemay be bent, as pointed out, in the axis is, 70 into a winding or coil and could replace the secondary winding of the current transformer t this gives an arrangement as in Fig. 6.

My invention in its broadest aspects is described and hereinafter claimed in the accompanying claims, wherein,

the terms frequency changer, frequency changer modulator, and'modulator have all been'used to define the specific form of both frequency changer and modulator but it is to be understoodthat the term frequency 7 changer modulator is intended to broadly cover the idea of either a frequency changer or a modulator or both and should, therefore, be considered in its broad sense.

, Having thus described my invention, what I claim is 2- 1. in combinatioin an iron corefrequency' changer modulator, a. volta e step-up transformer for introducinghigh frequency into the modulator and a" voltage step-down transformer for transferring energy output from the modulator to a load-circuit.

2. In direct current saturated static fre quency changing the method of reducing the saturating direc'trurrent which comprises steppingup the high frequency voltage a -c pliedto the frequency changer to reduce e amplitude of the corresponding alternating current whereby the saturating direct cura value approximately equal to the amplitude Y of the alternating current supplied and stepping-down the modulated high frequency voltage in the output circuit for the purpose of bringing the high frequency alternating currentamplitude back to its normal value.

4. In combination, a high frequency sup? ply circuit, a frequency changer modulator circuit, and a load circuit, voltage step-up transformer means for coupling said supply circuit to said modulator circuit, and voltage step-down transformer means for coupling said modulator to said load circuit, said voltage step-up transformer stepping up applied voltages in said modulator circuit and reducing the current in said circuit for protecting said modulator from the effects of high currents in said supply circuit. L

' 5. In combination, ahigh frequency supplycircuit; a frequency changer modulator, and a load circuit, said. frequency changer modulator comprising an iron coated copper conductor arranged bil'ilar with. respecttolow frequency modulating and saturatmg currents and having parallel paths with respect to high frequency energy, means for.

supplying both low and high frequency energies to said frequency changer modulator, said latter named means including a transformerfor coupling said biiilar frequency changer modulator to said supply circuit in voltage step-up relation whereby the amplitude of the high frequency-current reaching said frequency changer s reduced, and

means for connecting said modulator with said load circuit, said means being adapted to reduce the current strength supplied to said modulator, and means-for introducing the output energy from said modulator into said load circuit.

7. In combination, an energy supply circuit, a frequency changer modulator, and a load circuit, said frequency changer modulator comprising a coiled bifilar Wound conductor arranged in bridge formation, voltage step-up transformer means adapted to reduce current strength in the out-put circuit of said transformer for connecting said frequency changer modulator with said supply circuit, and voltage'step-down transformer means for introducing the output energy from said frequency changer modulator into said load circuit.

8. In combination, a high frequency enorgy supply circuit, a frequency changer modulator, and a load circuit, said frequency changer modulator comprising a bifilar conductor arranged in bridge formation, means for supplying a modulating current to said conductor at opposite corners of said bridge formation, voltage step-up transformer means for supplying high frequency energy at diagonally opposite corners of said bridge from said modulating current supply, said step-up transformer being adapted to reduce the current strength supplied to said frequency changer modulator from said high requency supply circuit, and voltage stepdown transformer means for delivering the output energy from said frequency changer modulator to said load circuit with a current strength substantially equal to that of said supply circuit.

9. The system claimed in claim 8 wherein said bifilar conductor is coiled and adapted for use as a portion of one of said transformers.

10. In combination, a high frequency supply circuit, a frequency changer modulator, and a load circuit, said frequency changer modulator comprising a coiled bifilar conductor arranged in bridge formation, a source of modulating current, said modulating current being connected with said frequency changer modulator at diagonally opposite points on said bridge formation and adapted to flow in a series path with respect to the said bridge, means including the said coiled bifilar conductor for inductively connecting said frequency changer modulator in Voltage step-up relationship with said high frequency supply, said high frequency energy transferred being adaptedrent, and means for coupling the output energy of said frequency changer modulator in voltage step-down relationship with said load circuit whereby the high frequency current amplitude is transformed to approximately its original value.

MENDEL osNos, 

